From Scharmbeck's Cryptostocks Info:

"1. A randomly selected Scharmbeck Feeshare (SBFS) holder will be invited to perform the simple bounty task within seven (7) days of Scharmbeck selling out second round SBFS shares on the Cryptostocks exchange (https://cryptostocks.com/securities/60)."

Technically, the 500 btc is not a give-away.  A bounty must be performed.